can anyone give me some advice....i intend to purchase a compass rallye 634 and hope to take delivery march 2005....i drive a merc E320...the vehicle is already low at the back and i want to beef it up so i dont ground ie when going on ferries etc...my outfit is within the peramiters but want to be safe rather than sorry....i have before used in other cars donuts but im not to impressed with them ....can anyone help re any advice on spring assisters which are of any use ..or replacement shockers that can be pumped up when towing is reaquired...and ideas and if poss approx cost i may be facing...many thanks for anyone answering this